Study On Deformation Mechanism Of The Surrounding Rock And Its Supporting Technology Of Large Cross Section Chamber In Wangzhuang Coal Mine

With the highly mechanized and large-scale to mining equipment and transport equipment, the demand for roadway section is also increasing. Large section roadway or chamber, especially in large section roadway which section of 96m2, large range of surrounding rock loose circle and supporting structure is affected by ground stress and the surrounding rock stress redistribution is more apparent, with a large range of surrounding rock loose circle, affected of supporting structure by ground stress and rock stress redistribution is more obvious. Therefore, study the characteristics of deformation and failure of large section cavern and supporting technology is of great significance.Combining with the field observation and theoretical analysis, according to the stent extreme makeover cavern surrounding rock failure pattern, failure process and its causes, the damage types can be divided into loose destruction, tensile failure and shear failure, rock burst damage and expansion deformation. That supports the deformation and failure of reloading chamber in the original scheme supporting is the main cause of big cross section, high stress and rock strength is low and the support is not reasonable.According to the deformation and failure characteristics of the reloading chamber,the stability principle of zonal control of coupling support for large cross section chamber was put forward. For chamber surrounding rock broken zone, plastic zone and elastic zone, the extent of damage gradually decreases, and the characteristics that the support strength is gradually reduce when surrounding rock stabilize, uses bolt and grouting anchor cable, long anchor cable coordination support; High-strength, high preload anchor net support, fully gives play to the role of bolt anchor cable support and surrounding rock self-bearing capacity; The rock reinforcement of Zoning grouting, improves the surrounding rock mechanical properties and the stability. Through the Flac3 D numerical simulation, analyze of large section chamber partition stability control effect, proposed the district stability control technology: 3m long bolt, 8.3m long grouting cable, 15 m long cable, forms three levels of load ring of 0 ~ 3m, 3 ~ 8m, 8 ~ 15 m from shallow to deep, to verify the feasibility of the program by a similar simulation; By theoretical calculation and numerical simulation method, the deformation and failure characteristics are analyzed for large section chamber bottom, two kinds of floor control technology, anti-bottom arch and floor anchor group reinforced, are proposed. Two floor control scheme is established with FLAC3 D numerical calculation to compare the supporting effect. The results show that: partition coupling stability control technology for surrounding rock control chamber can be very good help; The bottom cable controlling of large section chamber bottom swelling have good effect.Partition coupling stability control technology carried on industrial application in Wang Zhuang coal mine on reloading chamber, observation results show that the deformation of roadway surrounding rock obtained good control, enhanced the overall stability of the roadway.